Intrinsic three-dimensionality in electromagnetically driven shallow flows R. A. D. Akkermans, L. P. J. Kamp, H. J. H. Clercx and G. J. F. van Heijst EPL, 83 2 (2008) 24001 Published online: 19 June 2008 DOI: 10.1209/0295-5075/83/24001